Here is an interesting comparison of Cortana over the course of the 4 halo games:
PTesh adds his dulcet prepubescent tones over the top of one of the new trailers for weapons...
Try upgrading your browser to Google chrome (you wont regret it). There is probably an IE...
B.O.B Elite Easter Egg
The B.O.B easter egg is an unusual one in the sense that you can only find it online at Bungie.net after killing special elites in game. Once you kill one of these special elites, a medal will appear in your profile that is found nowhere else in the game stats. Finding these elites can be tricky, but there are several on each level. The image you can see below is of the medal you receive on Bungie.net